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The concept of organic evolution is central to physical and biological anthropology, as it explains the origin, development, and diversification of species, including humans. Organic evolution refers to the gradual and cumulative changes in the heritable characteristics of populations over successive generations. These changes lead to the formation of new species and the adaptation of organisms to their environments. Several theories have been proposed to explain the mechanisms of organic evolution, ranging from early philosophical ideas to more scientifically grounded frameworks. Among the most notable theories are the Lamarckian theory of inheritance, Darwin’s theory of natural selection, the modern synthetic theory of evolution, and mutation theory. Each of these theories offers unique insights into the process of evolution and the factors that drive biological diversity. One of the earliest systematic attempts to explain organic evolution was made by Jean-Baptiste Lamarck in the early 19th century. Lamarck proposed the theory of inheritance of acquired characters, also known as Lamarckism. According to this theory, organisms acquire certain characteristics during their lifetime as a result of environmental pressures or their own actions, and these acquired traits are then transmitted to their offspring. Lamarck emphasized two main principles to explain this process: the principle of use and disuse and the principle of inheritance of acquired characteristics. The principle of use and disuse ________ _____ __________ _____ ________ ________.
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